KR960004696B1 - Digital echo canceller - Google Patents

Digital echo canceller Download PDF

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Publication number
KR960004696B1
KR960004696B1 KR88008398A KR880008398A KR960004696B1 KR 960004696 B1 KR960004696 B1 KR 960004696B1 KR 88008398 A KR88008398 A KR 88008398A KR 880008398 A KR880008398 A KR 880008398A KR 960004696 B1 KR960004696 B1 KR 960004696B1
Authority
KR
South Korea
Prior art keywords
echo canceller
digital echo
digital
canceller
echo
Prior art date
Application number
KR88008398A
Other languages
Korean (ko)
Other versions
KR890003156A (en
Inventor
Petrus Josephus Van Gerwen
Franciscus Antonius Mar Delaar
Hendrik Jan Kotmans
Original Assignee
Philips Nv
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Philips Nv filed Critical Philips Nv
Publication of KR890003156A publication Critical patent/KR890003156A/en
Application granted granted Critical
Publication of KR960004696B1 publication Critical patent/KR960004696B1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
    • H04B3/23—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers
    • H04B3/237—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers using two adaptive filters, e.g. for near end and for end echo cancelling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
    • H04M9/082—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic using echo cancellers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
    • H04B3/23—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers
    • H04B3/234—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers using double talk detection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
    • H04B3/23—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers
    • H04B3/238—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers using initial training sequence
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S367/00—Communications, electrical: acoustic wave systems and devices
    • Y10S367/901—Noise or unwanted signal reduction in nonseismic receiving system
KR88008398A 1987-07-10 1988-07-07 Digital echo canceller KR960004696B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8701633A NL8701633A (en) 1987-07-10 1987-07-10 DIGITAL ECHO COMPENSATOR.
NL8701633 1987-07-10

Publications (2)

Publication Number Publication Date
KR890003156A KR890003156A (en) 1989-04-13
KR960004696B1 true KR960004696B1 (en) 1996-04-11

Family

ID=19850292

Family Applications (1)

Application Number Title Priority Date Filing Date
KR88008398A KR960004696B1 (en) 1987-07-10 1988-07-07 Digital echo canceller

Country Status (7)

Country Link
US (1) US4903247A (en)
EP (1) EP0301627B1 (en)
JP (1) JP2936101B2 (en)
KR (1) KR960004696B1 (en)
CA (1) CA1318003C (en)
DE (1) DE3880228T2 (en)
NL (1) NL8701633A (en)

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US20020101982A1 (en) * 2001-01-30 2002-08-01 Hammam Elabd Line echo canceller scalable to multiple voice channels/ports
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US7027962B2 (en) * 2003-11-19 2006-04-11 International Business Machines Corporation System and method for self-configuring and self-optimizing filters
US7480377B2 (en) * 2003-12-31 2009-01-20 Intel Corporation Dual adaptive filter apparatus and method
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US7760887B2 (en) * 2004-10-15 2010-07-20 Lifesize Communications, Inc. Updating modeling information based on online data gathering
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US20060132595A1 (en) * 2004-10-15 2006-06-22 Kenoyer Michael L Speakerphone supporting video and audio features
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US7720236B2 (en) * 2004-10-15 2010-05-18 Lifesize Communications, Inc. Updating modeling information based on offline calibration experiments
US7720232B2 (en) * 2004-10-15 2010-05-18 Lifesize Communications, Inc. Speakerphone
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US7991167B2 (en) * 2005-04-29 2011-08-02 Lifesize Communications, Inc. Forming beams with nulls directed at noise sources
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US7593539B2 (en) * 2005-04-29 2009-09-22 Lifesize Communications, Inc. Microphone and speaker arrangement in speakerphone
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JP4769161B2 (en) * 2006-10-11 2011-09-07 日本電信電話株式会社 Echo canceller apparatus, method thereof, program thereof, and recording medium thereof
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US9514763B2 (en) * 2013-05-15 2016-12-06 Lenovo (Singapore) Pte. Ltd. Noise reduction via tuned acoustic echo cancellation
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NL8601604A (en) * 1986-06-20 1988-01-18 Philips Nv FREQUENCY DOMAIN BLOCK-ADAPTIVE DIGITAL FILTER.

Also Published As

Publication number Publication date
DE3880228T2 (en) 1993-10-14
JPS6434021A (en) 1989-02-03
CA1318003C (en) 1993-05-18
KR890003156A (en) 1989-04-13
JP2936101B2 (en) 1999-08-23
EP0301627A1 (en) 1989-02-01
DE3880228D1 (en) 1993-05-19
EP0301627B1 (en) 1993-04-14
US4903247A (en) 1990-02-20
NL8701633A (en) 1989-02-01

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A201 Request for examination
G160 Decision to publish patent application
N231 Notification of change of applicant
E701 Decision to grant or registration of patent right
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